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Assets Held for Sale (Detail) - USD ($)
3 Months Ended 9 Months Ended
Oct. 28, 2018
Jan. 27, 2019
Jan. 28, 2018
Long Lived Assets Held-for-sale [Line Items]      
Proceeds from the sale of property, plant, and equipment   $ 1,894,000 $ 6,000
Gain on sale of property, plant, and equipment   1,456,000  
Upholstery Fabrics [Member]      
Long Lived Assets Held-for-sale [Line Items]      
Property, plant, and equipment classified as held for sale $ 393,000    
Impairment of assets held for sale $ 0    
Proceeds from the sale of property, plant, and equipment   1,900,000  
Gain on sale of property, plant, and equipment   1,486,000  
Upholstery Fabrics [Member] | Property, Plant and Equipment [Member]      
Long Lived Assets Held-for-sale [Line Items]      
Assets held for sale   $ 0